# coding: utf-8
#
# Copyright © 2012-2015 Ejwa Software. All rights reserved.
#
# This file is part of gitinspector.
#
# gitinspector is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# gitinspector is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with gitinspector. If not, see <http://www.gnu.org/licenses/>.

from __future__ import unicode_literals
import datetime


class TimelineData(object):
    def __init__(self, changes, useweeks):
        authordateinfo_list = sorted(changes.get_authordateinfo_list().items())
        self.changes = changes
        self.entries = {}
        self.total_changes_by_period = {}
        self.useweeks = useweeks

        for i in authordateinfo_list:
            key = None

            if useweeks:
                yearweek = datetime.date(int(i[0][0][0:4]), int(i[0][0][5:7]), int(i[0][0][8:10])).isocalendar()
                key = (i[0][1], str(yearweek[0]) + "W" + "{0:02d}".format(yearweek[1]))
            else:
                key = (i[0][1], i[0][0][0:7])

            if self.entries.get(key, None) == None:
                self.entries[key] = i[1]
            else:
                self.entries[key].insertions += i[1].insertions
                self.entries[key].deletions += i[1].deletions

        for period in self.get_periods():
            total_insertions = 0
            total_deletions = 0

            for author in self.get_authors():
                entry = self.entries.get((author[0], period), None)
                if entry != None:
                    total_insertions += entry.insertions
                    total_deletions += entry.deletions

            self.total_changes_by_period[period] = (total_insertions, total_deletions,
                                                    total_insertions + total_deletions)

    def get_periods(self):
        return sorted(set([i[1] for i in self.entries]))

    def get_total_changes_in_period(self, period):
        return self.total_changes_by_period[period]

    def get_authors(self):
        return sorted(set([(i[0][0], self.changes.get_latest_email_by_author(i[0][0])) for i in self.entries.items()]))

    def get_author_signs_in_period(self, author, period, multiplier):
        authorinfo = self.entries.get((author, period), None)
        total = float(self.total_changes_by_period[period][2])

        if authorinfo:
            i = multiplier * (self.entries[(author, period)].insertions / total)
            j = multiplier * (self.entries[(author, period)].deletions / total)
            return (int(i), int(j))
        else:
            return (0, 0)

    def get_multiplier(self, period, max_width):
        multiplier = 0

        while True:
            for i in self.entries:
                entry = self.entries.get(i)

                if period == i[1]:
                    changes_in_period = float(self.total_changes_by_period[i[1]][2])
                    if multiplier * (entry.insertions + entry.deletions) / changes_in_period > max_width:
                        return multiplier

                    multiplier += 0.25

    def is_author_in_period(self, period, author):
        return self.entries.get((author, period), None) != None

    def is_author_in_periods(self, periods, author):
        for period in periods:
            if self.is_author_in_period(period, author):
                return True
        return False
